Authors Kumar, L. ; Horechyy, A. ; Bittrich, E. ; Nandan, B. ; Uhlmann, P. ; Fery, A.
Title Amphiphilic block Copolymer micelles in selective solvents: The effect of solvent selectivity on micelle formation
Date 14.11.2019
Number 57944
Abstract We investigated the micellar behavior of a series of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers in different P4VP-selective alcoholic solvents. The micellar behavior was further correlated with the spectroscopic ellipsometry results obtained on swelling of PS and P4VP polymer films in the corresponding solvent vapors. The time-resolved (in situ) dynamic light scattering (DLS) measurements, in combination with (ex situ) electron microscopy imaging, revealed information about the aggregation state of PS-b-P4VP BCP in different alcohols and the effect of heat treatment. The ellipsometry measurements allowed us to estimate the difference in solvent selectivity toward PS/P4VP pair. Both DLS and ellipsometric studies suggested that less polar alcohols (i.e., 1-propanol, 1-butanol, and 1-pentanol) are likely to be close to each other in terms of their selectivity toward PS/P4VP pair, whereas more polar ethanol and methanol show the highest and the lowest affinity toward P4VP, respectively.
Publisher Polymers
Citation Polymers 11 (2019) 1882
Tags block copolymer micelles selective solvent solution self-assembly ps-b-p4vp p4vp corona spectroscopic ellipsometry vapor swelling

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